Fresh concrete properties

Abstract

Concrete constituted of coarse recycled concrete aggregate and supplementary cementitious materials must display technical properties similar to or within an acceptable range of deviation when compared to the existing conventional concrete. This enables reliable adoption of the new materials as alternative concrete constituents in practice. This chapter explores the material level concrete properties in the fresh state focusing on the role of coarse recycled concrete aggregates (coarse RCA) and challenges associated with it. Then the synergistic effects of SCMs and coarse RCA in concrete are explored. Fresh concrete properties focused here are workability, segregation, and bleeding, and setting time. The roles of SCMs discussed in this chapter are limited to the widely available materials such as fly ash, slag, and silica fume.